Cp/Cv formulas

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Jennifer Lathrop 1F
Posts: 71
Joined: Sat Dec 02, 2017 3:00 am

Cp/Cv formulas

Postby Jennifer Lathrop 1F » Wed Jan 30, 2019 5:14 pm

On the formula sheet,Cp=(5/2)R. In the book, this is only true in regards to atoms, but for linear molecules its stated at Cp=(7/2)R. In the example 4C.1 for 7th addition they use (7/2). Cv is similar with Cv=(3/2)R and (5/2)R for linear molecules. When do you know which equation to use?

Andrea Zheng 1H
Posts: 61
Joined: Fri Sep 28, 2018 12:26 am

Re: Cp/Cv formulas

Postby Andrea Zheng 1H » Wed Jan 30, 2019 5:39 pm

Cv = (3/2)R and Cp = (5/2)R would be true for any monoatomic ideal gas, so you would use these equations in those cases.
If a molecule is linear, it wouldn't be a monoatomic ideal gas, so you would use the other equations for constant pressure and constant volume.

Jennifer Lathrop 1F
Posts: 71
Joined: Sat Dec 02, 2017 3:00 am

Re: Cp/Cv formulas

Postby Jennifer Lathrop 1F » Sun Feb 03, 2019 10:54 pm

Thank you!


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